Abstract
An evaluation method for ground motion has been proposed considering the effects of constituent pulse waves. First, a triangular pulse wave model representing the skeleton of a strong motion has been proposed in order to evaluate characteristics such as amplitude, predominant period and the temporal properties. Next, a technique for time-frequency analysis taking advantage of the energy input rate (EIR) has been proposed in the light of the amplitude, the direction and the time-position of the constituent pulse waves. It has been found out that the combination of the sign and amplitude of both acceleration pulse input and structural velocity response determine the structural response. The proposed method can be used for analyzing the effect of pulse waves on amplification and damping of structural responses, and the relevance of pulse waves to impulsive load and/or resonance of structure. Five ground motion records observed during four inland crustal earthquakes in Japan have been used for numerical examples.
